sql-server - 删除触发器不起作用

Question

我创建了一个简单的删除触发器，该触发器被触发但 0 行受到影响。父表记录已删除。但是表中的记录也应该删除而不是删除。我有以下查询。

ALTER trigger [dbo].[studentAuditActionDelete] on [dbo].[tblStudent]

after delete
AS

declare @studentId_Audit int;

    select @studentId_Audit = i.studentID from inserted i;  
    delete from studentAudit
    where
    studentId_Audit = @studentId_Audit
    PRINT 'AFTER Delete trigger fired.'

Answer 1

您是否尝试过从deleted

select @studentId_Audit = d.studentID from deleted d;

请记住，deleted可以包含多行，您只能选择其中之一！（这是为了让所有触发器记住inserted、updated和deleted）

Answer 2

不要在触发器中声明变量，将简单的 JOIN 与源表 DELETED 一起使用，您将能够使用多次删除

CREATE TRIGGER [dbo].[studentAuditActionDelete] on [dbo].[tblStudent]
FOR DELETE
AS
  DELETE a
  FROM studentAudit a JOIN deleted d ON a.studentId_Audit = d.studentID  
  PRINT 'AFTER Delete trigger fired.'